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United States Patent 4832883
Douris , ê et al. May 23, 1989


Method and apparatus for controlling screw positions in injection molding

Kato , Ê et al. May 23, 1989

Abstract

A method for controlling an injection molding machine involving the steps of: detecting, by a screw position detector, a position of a screw of the injection molding machine immediately before the start of injection, to produce a detecting signal; comparing the detecting value with a predetermined value for a plasticizing/measurement position set in a metering position setter, to calculate any deviation therebetween; and adding/substracting the deviation to or from predetermined values representative of switching-over positions set in switching-over position setters, thereby keeping constant an actual screw stroke from the plasticizing/measurement position to the switching-over position for every shot of the injection molding machine.

 

 

 

 

 

 

 

 

 

 

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